Line 6 M series pedals are great, but sadly lack the ability to control beat divisions with the expression pedal(s).
However, this morning whilst playing around with my pedal board trying to get some sounds for a new gig I stumbled on a little workaround if you're wanting to control beat divisions of a hard trem effect (useful for those trying to achieve dubstep wobbles).
Thought some might find it useful...
Here we go:
1. Pull up the "Pattern Tremolo" patch in the Mod section
2. Assign the "speed" knob to beat division: Crotchet (1/4 note)
3. Set all but one of the number knobs to "SKIP" (or set them all to the same number values)
4. Set your remaining knob to "1" in heel down, then "3" in toe down.
Set the tempo by tapping and you'll now be able to sweep from 1/4 notes to 1/8 note triplets, with standard 1/8 notes in the middle of the sweep.
Setting the beat division to lower values allows wider sweeps: Whole note allows you to sweep between most divisions you could want (except dotted notes) - the number value denoting how many beats will fall in the bar... though this makes it harder to hit the in between settings of the sweep accurately, hence my favouring the 1/4 note setting... thought i imagine some practice would help here.
Unfortunately this effect doesn't allow any other control over the trem settings: basically it's fixed on a hard square wave trem.
Now you can wobble that bass to your hearts delight!